Understanding freeradius

RODOLPHE ANTONIO DE ARAUJO MARQUES rodolphe.marques at ua.pt
Fri Dec 12 17:35:51 CET 2008


One more question, I need to access another module data 
structure, for instance I want to retreive the emsk key 
that the rlm_eap module creates and saves in the 
eapsim_keys structure, and save in a structure created by 
my module. Is this possible?

Rodolphe Marques

Em Fri, 12 Dec 2008 15:30:37 +0100
  Alan DeKok <aland at deployingradius.com> escreveu:
>> I'm currently developing a new 802.11 authentication and 
>> protocol to achieve fast handovers in 802.11 
>>infrastructured networks.
>> I need to add a new module to freeradius to manage new 
>>keys that will be
>> derived during the initial 802.1X authentication.
>> What I need from freeradius is to add new attributes in 
>> Access-Request and Access-Accept messages and save some 
>>data in a new
>> structure for each user.
>  That should be easy.
>> I've been looking at the code, and reading the wiki 
>>trying to understand
>> how freeradius work, but  with no success.
>  See src/modules/rlm_example for an example module.  It 
>uses the
> internal API to look for, and add, sample attributes.
>> Can anyone help me getting started by pointing some 
>>functions where the
>> freeradius reads and constructs messages, sends and 
>>receive and how it
>> choses the authentication method, or any other useful 
>>information that
>> may help me achieve my goal?
>  Don't look at the functions that send/receive messages.
>  The server is designed so that the modules don't have 
>to understand
> how it processes RADIUS packets.  The server is designed 
>so that the
> modules don't need to know how authentication methods 
>are chosen.
>  See the CHAP module for a simple example of a module 
>that looks for
> certain attributes, and does authentication.
>  See the MS-CHAP module for a more complicated example 
>of a module that
> adds attributes to the Access-Accept.
>  Alan DeKok.
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